With the release of VMware vSphere 5.0 a new version of the VMFS datastores was released also: VMFS-5. This new VMFS-5 version has a lot of advantages over the old VMFS-3 version (see for information about the new features Cormac Hogan’s post vSphere 5.0 Storage Features Part 1 – VMFS-5). You can upgrade your VMFS-3 datastores to VMFS-5 while VM’s on the datastores keep running. In this post I will show you the vSphere PowerCLI Upgrade-VmfsDatastore function that will do the upgrade for you. Read more of this post